Head rest cover having flag design



FIG. 1 is a perspective, front view of the head rest cover having flag design showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines showing in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a head rest cover having flag design, as shown and described. 